Principles and practice of operative dentistry . Guilford matrices, and manuer of adjustment. v^antage of being readily adapted to the cervix of the tooth, and is main-tained in position by means of two set screws, which rest against the toothopposite the approximal cavity to be filled and act as separators. Fig. Woodward double-screw matrices. A-S the teeth move under the pressure of the screws, it becomes neces-sary to occasionally tighten them. The space thus gained is of great valueduring the process of finishing the filling. TIN FOIL. Chemically pure tin is furnished to the dentist
Principles and practice of operative dentistry . Guilford matrices, and manuer of adjustment. v^antage of being readily adapted to the cervix of the tooth, and is main-tained in position by means of two set screws, which rest against the toothopposite the approximal cavity to be filled and act as separators. Fig. Woodward double-screw matrices. A-S the teeth move under the pressure of the screws, it becomes neces-sary to occasionally tighten them. The space thus gained is of great valueduring the process of finishing the filling. TIN FOIL. Chemically pure tin is furnished to the dentist in three forms,—foil,fibrous mats, and rolled strips. Foil is the form most generally is beaten after the same manner as gold, and is furnished to the pro-fession usually in two weights, No. 3 and No. 4, the figures representing 334 OPERATIVE DENTISTRY. the weight of the foil in grains. Ko. 3 foil is the weight in most generaluse. The fibrous mais or ^?fibrous tin^^ is made from fine shavings of tinloosely pressed into mats. This form of tin has a tendency to crumble,and is therefore not so readily introduced into the cavity as foil, neitherhas it any advantages which are not possessed in an equal or higher degreeby the foil. Boiled strips of tin are about the weight of No. 20 gold-foil, and areus
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectdentist, bookyear1920
